At one level they're very rational I think, particularly when, as the article points out, most people, quite wrongly, expected Ukraine to lose very quickly.
The Germans have a very strong tradition post WW2 of not engaging in foreign wars. For very understandable and noble reasons. Overturning that isn't a trivial task.
The French seem intent on keeping diplomatic channels open, which again is laudable given that there will be a need to negotiate eventually.
None of which is meant to imply either have "done the right thing". Neither have we, perhaps, compared to Estonia!
I don't have the knowledge to have a worthwhile opinion on quantities of military aid, its possibilities or practicalities. My sense is that the Germans have done more than they get credit for. I could be wrong.